I use a password manager, and generate passwords using the xkcd aproach[0] (only more words), which so have like 50-70 characters total. Easy to type in if I happen to use a retarded app which doesn't let me paste or something like a game console, but secure enough for me. On retarded sites which restrict passwords to length or characters or need some characters, I need a minute or two to modify the generated one (and maybe can't login after registering, as the max length on register is longer than on login).
If this simple modification which I have to do one time costs me a minute, how many years of my life will it take to go through some algorithm, and this every single time I log in?
Besides any security considerations, its just too much of a hassle for me to use some password algorithm technique.